对于有理数a、b,定义运算:a⊗b=a×b-a-b+1 (1)计算(-3)⊗4的

题型:解答题

问题:

对于有理数a、b,定义运算:a⊗b=a×b-a-b+1

(1)计算(-3)⊗4的值;

(2)填空:5⊗(-2)______(-2)⊗5.(填“>”或“=”或“<”)

(3)a⊗b与b⊗a相等吗?若相等,请说明理由.

考点:有理数的混合运算
题型:解答题

The following data sufficiency problems consist of a question and two statements, labeled (1) and (2), in which certain data are given. You have to decide whether the data given in the statements are sufficient for answering the question. Using the data given in the statements plus your knowledge of mathematics and everyday facts (such as the number of days in July or the meaning of counterclockwise), you must indicate whether.

A dairy farmer has two milk pails, M and P. Milk pail M is 1/3 full. How much milk is in P relative to M ?()
(1) If M is poured into P, P will be full.
(2) Milk pail P is smaller than M.

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D. EACH statement ALONE is sufficient.

E. Statements (1) and (2) TOGETHER are NOT sufficient.

题型:解答题

渠道选线时,如条件许可,渠道走向尽量与当地一般风向一致。

题型:解答题

角膜缘干细胞的功能障碍可导致()

A.角膜上皮的鳞状化生

B.泪液膜的功能障碍

C.角膜上皮细胞来源障碍

D.角膜上皮的角化

E.角膜上皮功能障碍

题型:解答题

氧化锆氧量仪以()作电介质,高温下的电介质两侧浓度不同时,形成氧浓差电池,氧浓差电池产生的电动势与两侧氧浓度有关。

A、氧化锆

B、HCl溶液

C、电石

D、NaCl

题型:解答题

下列( )项不属于生态建设和环境保护的主要政策。

A.产业政策
B.技术政策
C.税收政策
D.建立健全生态机制

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